+#ifdef CONFIG_USB_MUSB_OTG
+
+/*
+ * See also USB_OTG_1-3.pdf 6.6.5 Timers
+ * REVISIT: Are the other timers done in the hardware?
+ */
+#define TB_ASE0_BRST 100 /* Min 3.125 ms */
+
+/*
+ * Handles OTG hnp timeouts, such as b_ase0_brst
+ */
+void musb_otg_timer_func(unsigned long data)
+{
+ struct musb *musb = (struct musb *)data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&musb->lock, flags);
+ if (musb->xceiv.state == OTG_STATE_B_WAIT_ACON) {
+ DBG(1, "HNP: B_WAIT_ACON timeout, going back to B_PERIPHERAL\n");
+ musb_g_disconnect(musb);
+ musb->xceiv.state = OTG_STATE_B_PERIPHERAL;
+ musb->is_active = 0;
+ }
+ spin_unlock_irqrestore(&musb->lock, flags);
+}
+
+static DEFINE_TIMER(musb_otg_timer, musb_otg_timer_func, 0, 0);
+
+/*
+ * Stops the B-device HNP state. Caller must take care of locking.
+ */
+void musb_hnp_stop(struct musb *musb)
+{
+ struct usb_hcd *hcd = musb_to_hcd(musb);
+ void __iomem *mbase = musb->mregs;
+ u8 reg;
+
+ switch (musb->xceiv.state) {
+ case OTG_STATE_A_PERIPHERAL:
+ case OTG_STATE_A_WAIT_VFALL:
+ DBG(1, "HNP: Switching back to A-host\n");
+ musb_g_disconnect(musb);
+ musb_root_disconnect(musb);
+ musb->xceiv.state = OTG_STATE_A_IDLE;
+ musb->is_active = 0;
+ break;
+ case OTG_STATE_B_HOST:
+ DBG(1, "HNP: Disabling HR\n");
+ hcd->self.is_b_host = 0;
+ musb->xceiv.state = OTG_STATE_B_PERIPHERAL;
+ reg = musb_readb(mbase, MGC_O_HDRC_POWER);
+ reg |= MGC_M_POWER_SUSPENDM;
+ musb_writeb(mbase, MGC_O_HDRC_POWER, reg);
+ /* REVISIT: Start SESSION_REQUEST here? */
+ break;
+ default:
+ DBG(1, "HNP: Stopping in unknown state %s\n",
+ otg_state_string(musb));
+ }
+}
+
+#endif
+